For the body mounts, you can do what the shop suggested and then coat the whole deal with a rust preventative coating like POR-15 or Coroless, or you can buy all new mounts and cut the old ones off and weld the new ones on. As far as the crossmember, I haven't seen anyone reproducing them...this is one of a few items that fall into this category...I tempted to start a small business cranking out items like this. You can weld some flat stock to the existing unit and then cut it (hole saw) for the body mounts.